Submerged construction method - Chinmai Kouhou

Japanese: 沈埋工法 - ちんまいこうほう

A method of constructing undersea tunnels. It is a prefabricated method in which huge concrete boxes are lined up on the seabed to create an undersea tunnel, and is used when the ground is weak and it is difficult to dig a large-diameter tunnel. It has been adopted in the United States, the Netherlands, and Japan (Tokyo Port Tunnel). It is used in two places: the mouth of the Tama River on the Tokyo Wangan Expressway and the entrance and exit to Kawasaki Port. After a block 10m high, 40m wide, 130m long, and weighing 52,000t is completed in the dock, the entrance and exit are closed with iron doors, and it is towed by a tugboat to the site about 20m deep, where it is connected to a six-lane road and evacuation passages.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

海底トンネルの工事方法の一つ。巨大なコンクリート製の箱を海底に並べて海底トンネルを造るプレハブ工法で，地盤が弱く大口径のトンネルを掘ることが困難な場合に用いられる。アメリカやオランダ，日本 (東京港トンネル) で取り入れられている。東京湾岸道路の多摩川河口部と川崎港出入路の2ヵ所で使われている。高さ 10m，幅 40m，長さ 130m，重さ5万 2000tのブロックをドックで完成後，出入口を鉄の扉で閉め切り，タグボートでえい航して水深約 20mの現場に沈めてつなげ，6車線の道路と避難用通路などを通す。

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